StackedBarChart animation starts from mid-height instead of zero

[H-CLo]

Hi, thank you for this great charting library!

I'm using StackedBarChart in a SwiftUI app to display quarterly sales, and noticed that when the chart animates on appearance, the bars do not grow from the baseline (y = 0). Instead, the animation starts from around the mid-height of the chart.

This behavior can be seen in the attached screenshot. Based on the documentation and expected behavior, I believe the animation should start from the bottom of the chart (i.e. from zero) and grow upward.

Environment:
Xcode: 16.3
iOS Simulator: 18.2
SwiftUICharts: 2.10.3

Steps to reproduce:
1. Clone the SwiftUICharts demo app.
2. Copy the StackedBarChart example code into a new SwiftUI project.
3. Run the app on a physical device or simulator.
4. Observe that when the view appears, the bars animate from around the vertical center of the chart instead of from the bottom (0.0).

Expected behavior:
The bar animation should originate from the bottom (0.0) of the chart area.

Screenshot:

Let me know if you need a minimal reproducible example. I'd be happy to provide code.

Thanks again for your work!